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[*]I feel like I screwed up with "σε εκείνα την ατύχημα" part. The article is used even with demonstratives, right?

Nouns like το ατύχημα that end in -μα are predominantly of the neuter gender, and they have a special declension. Το ατύχημα (nom./acc. sing.) becomes τα ατυχήματα in the plural (nom./acc.), του ατυχήματος in the gen. sing., and των ατυχημάτων in the gen. plural. Remember to pay special attention to the stress placement in each form.